本技术规范的范围是提供a接口协议和移动应用部分之间互通的详细规范，以处理补充业务。感兴趣的映射接口是B、C、D和E接口。A、C、D和E接口是物理接口，而B接口是为建模目的定义的内部接口。本规范中与建模接口有关的信息不规范。补充业务信令可由MSC/VLR在- MSC间切换后的电子接口。就补充业务而言，该过程是透明的，因此本规范中未描述与该过程有关的互通。第2节描述了A和D物理接口之间互通的一般程序。第3节描述了SS版本协商的一般程序。第4节描述了第3层无线路径消息与事务能力（TC）事务子层消息之间的映射，以便在- 和D-物理接口。第5节描述了与呼叫相关的SS活动相关的所有接口的具体互通程序。第6节描述了与独立于呼叫的SS活动相关的所有接口的具体互通过程。第6节还介绍了MAP用户（参见TS GSM 09.02）与网络实体的SS处理功能（参见TS GSM 04.10和TS GSM 04.80）之间的互通。

The scope of this Technical Specification is to provide a detailed specification for interworking between the A interface protocol and the Mobile Application Part for handling of supplementary services. The MAP interfaces of interest are the B-, C-, D- and E-interfaces. The A-, C-, D- and E-interfaces are physical interfaces while the B-interface is an internal interface defined for modelling purposes. Information relating to the modelling interface is not normative in this specification. Supplementary service signalling may be passed by the MSC/VLR between the A- and E-interfaces after inter-MSC handover. This procedure is transparent as far as supplementary services are concerned therefore interworking concerning this process is not described in this specification. Section 2 describes general procedures for interworking between the A- and D- physical interfaces. Section 3 describes the general procedures for the SS version negotiation. Section 4 describes the mapping of layer 3 radio path messages with Transaction Capabilities (TC) transaction sublayer messages for interworking between the A- and D- physical interfaces. Section 5 describes specific interworking procedures for all interfaces relating to call related SS activity. Section 6 describes specific interworking procedures for all interfaces relating to call independent SS activity. Section 6 also covers the interworking between the MAP User (see TS GSM 09.02) and the SS handling functions of the network entities (see TS GSM 04.10 and TS GSM 04.80).